M1.1 earthquake near Calimesa, California, United States
A magnitude 1.1 earthquake struck near Calimesa, California, United States at 09:30 local time (16:30 UTC) on 24 Sept 2026, at a depth of 16 km, according to USGS. The solution is preliminary and may be revised.
Data: USGS · updated 2026-09-24 16:34 UTC · automatic solution
- Magnitude
- 1.1micro
local magnitude (Richter) (ml) - Depth
- 15.9 km
- Status
- Automatic
- Origin time
- 2026-09-24 16:30:59 UTC
- Local: 24 Sept 2026, 09:30:59 (America/Los Angeles)
- Epicentre
- 33.988° N, 117.079° W
Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| CalimesaCalifornia, United States · pop. 8,542 | 2 km | INot felt |
| YucaipaCalifornia, United States · pop. 53,328 | 6 km | INot felt |
| BeaumontCalifornia, United States · pop. 43,811 | 11 km | INot felt |
| RedlandsCalifornia, United States · pop. 71,035 | 12 km | INot felt |
| Moreno ValleyCalifornia, United States · pop. 204,198 | 15 km | INot felt |
| RiversideCalifornia, United States · pop. 317,261 | 30 km | INot felt |
| IrvineCalifornia, United States · pop. 256,927 | 77 km | INot felt |
| Santa AnaCalifornia, United States · pop. 310,227 | 78 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · CI.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey | 1.1 ml | 15.9 km | 33.99° N, 117.08° W | – | Automatic |
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How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 651 g of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.1 releases about 1.4× the energy of M1.0, and its waves are about 1.2× taller on a seismogram. Energy: 651 g of TNT vs 477 g of TNT.
Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
21 later earthquakes within 30 km; the largest was M1.5 15 h ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M1.1
21 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 1.00 | 1.1 | 15 |
| 12.83 | 1.2 | 13 |
| 19.13 | 0.9 | 14 |
| 19.16 | 0.7 | 14 |
| 29.34 | 0.7 | 11 |
| 31.14 | 0.8 | 13 |
| 36.12 | 0.8 | 16 |
| 43.83 | 1.0 | 13 |
| 58.34 | 1.2 | 9 |
| 68.24 | 0.9 | 3 |
| 70.46 | 0.8 | 11 |
| 71.24 | 1.0 | 11 |
| 77.14 | 1.2 | 18 |
| 77.15 | 1.1 | 18 |
| 78.19 | 0.7 | 2 |
| 79.21 | 0.8 | 16 |
| 85.30 | 0.8 | 15 |
| 85.31 | 0.9 | 14 |
| 87.78 | 0.8 | 12 |
| 91.62 | 1.5 | 14 |
| 99.80 | 1.1 | 15 |
- 1.5Near Loma Linda, California, United States09-28 12:07
- 1.24 km NE of Banning, California, United States09-27 02:51
- 1.27 km NE of Banning, California, United States09-27 21:39
- 1.28 km S of Beaumont, California, United States09-25 05:20
- 1.17 km NE of Banning, California, United States09-27 21:40
- 1.16 km S of Redlands, California, United States09-28 20:19
- 1.16 km S of Redlands, California, United States09-24 17:30
- 1.05 km WNW of Calimesa, California, United States09-26 12:20
- 1.06 km S of Loma Linda, California, United States09-27 15:45
- 0.99 km NE of Cherry Valley, California, United States09-27 12:45
- 0.94 km NW of Cherry Valley, California, United States09-28 05:49
- 0.97 km S of Redlands, California, United States09-25 11:38
- 0.8Near Loma Linda, California, United States09-25 23:39
- 0.89 km WSW of Beaumont, California, United States09-26 04:38
- 0.84 km NW of Cherry Valley, California, United States09-28 05:48
- 0.8Near Loma Linda, California, United States09-27 23:43
- 0.812 km NNE of Banning, California, United States09-28 08:17
- 0.86 km S of Loma Linda, California, United States09-27 14:58
- 0.76 km NE of Moreno Valley, California, United States09-25 21:51
- 0.77 km S of Redlands, California, United States09-25 11:40
- 0.77 km WSW of Big Bear Lake, California, United States09-27 22:42
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Event id ci41338551. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · CI (usgs:ci41338551). Cite as: SeismoAtlas, “M1.1 earthquake near Calimesa, California, United States”, https://seismoatlas.com/earthquake/ci41338551-m1-1-earthquake-near-calimesa-california-united-states, data from USGS.
JSON: /api/v1/events/ci41338551. SeismoAtlas is not an official warning service.